St. Andrew's Day honors St. Andrew, one of the twelve apostles of Jesus and the patron saint of Scotland, Greece, Russia and other countries. It is a day of religious observance and cultural celebration, especially in Scotland, where it is a national holiday.

Immaculate Conception Day is a major feast in the Catholic Church. It celebrates the belief that the Virgin Mary was conceived without original sin, a unique grace given by God to prepare her for her role as the Mother of Jesus Christ.

Christmas Eve is the evening or entire day preceding Christmas Day, which commemorates the birth of Jesus Christ. It is a public holiday in some countries, and it holds significant religious and cultural importance for Christians and is widely observed around the world.

Christmas Day is one of the most widely observed and culturally significant holidays around the world. It traditionally commemorates the birth of Jesus Christ, although it has also become a widely celebrated cultural holiday, often observed even by non-Christians.

Boxing Day is a holiday celebrated after Christmas Day, and it is a well-known holiday primarily celebrated in the United Kingdom and other countries that were part of the British Empire, as well as in some European nations.

New Year's Eve marks the final day of the Gregorian calendar year and is a significant occasion for many people around the world. It's a time to reflect on the past year and welcome the beginning of a new one.

The Epiphany, often referred to as the Feast of the Three Kings or Three Kings' Day, is a Christian celebration that commemorates the visit of the Magi (also known as the Wise Men or Three Kings) to the infant Jesus.

Orthodox Christmas Day is celebrated by Orthodox Christians around the world. The difference in date from the December 25 celebration of Christmas in the Western Christian tradition arises from the use of different calendars.

The Orthodox New Year is also known as the Old New Year. This tradition is observed in many Orthodox Christian countries and communities, particularly those that continue to follow the Julian calendar for religious celebrations.